Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea1640330ed058e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 08:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a112e9b65ff01164e878ff2e96307df SHA-1: cfe7dab927b9f63191a5220b4d8590f7f8002293 SHA-256: 4ea1640330ed058e0154b60e356ae3c0dcc2ef0d8f8baf58eb1206be0b766b6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload directories, suggesting a potential distribution mechanism for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://pi-consulting.ch/download/dinex.pdf In PDF document text
    • https://pasarangroup2.com/contents/files/24490475135.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/pezonujawefasilubap.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/6365877359.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/47568445444.pdfIn PDF document text
    • http://guowangcable.com/d/files/34478486604.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/70476881781.pdfIn PDF document text
    • http://poorclarescork.ie/images/77789718959.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/jofebijulajomupow.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/2483044268.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/dijowedufipujedovajeta.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/52725161450.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/b8c26cf8c201d87ce1c924ecb7ac9bba/maxofik.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/72793898103.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/sumisuj.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/13234905327.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/27601763847.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/turiribujevavijewabifuguf.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5fe0f188f---79089532970.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3bs33rkrn8hr0umcm3varja3d0/28400775779.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/2988851269.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/04456af340768a4edff6385c41a92a5b/81604945487.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a65364fb4110d55b9bea41288dbfa345/zotodofuxiribaxuxanopun.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/vezozosekixaxawuxewase.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ab0259a3---kidunexikajoserimelubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tom+and+jerry+2021+running+timePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 10976 bytes
SHA-256: 3b5d32c796d133a4f0f5255829e91c0b200caaf57bf40613391a63ab226514af
font_02_sfnt_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 17252 bytes
SHA-256: adb945679917a76754556360e5a8c138afd3411fc93e6434c32cc5fde4189b02